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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8899) Classpath exceeds maximum OS limit
Date Thu, 18 Oct 2012 04:36:06 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13478656#comment-13478656
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Suresh Srinivas commented on HADOOP-8899:
-----------------------------------------

Alejandro, this is manifest only jar. See similar things done in maven surefire - http://maven.apache.org/plugins/maven-surefire-plugin/examples/class-loading.html.

bq. then things will not work as expected as you'll lose some of those files in the consolidation
I do not understand given above comment. All you have done is create a jar with manifest file
that has classpath. What do mean by things will not work as expected? 
                
> Classpath exceeds maximum OS limit
> ----------------------------------
>
>                 Key: HADOOP-8899
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8899
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 1-win
>            Reporter: Ahmed El Baz
>         Attachments: HADOOP-8899.branch-1-win.classpath.patch
>
>
> We hit errors in TT due to long classpath value. One example is Oozie trying to start
a hive job, and it fails with the following error:
>  java.io.IOException: Command exceeds the OS command length limit: 8192, command: "set
CLASSPATH="….
> The classpath includes Hadoop Core + Hive Jars which are in the distributed cache. This
is causing the classpath to be too long giving the error above. A viable long term fix is
to generate a temporary JAR file in the task cache directory which includes all elements in
the long classpath, and then provide this as the "-classpath" argument for the JVM to be spawned.
This is gated for Windows only.

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